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Deposits (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deposits [Abstract]      
Noninterest-bearing demand $ 2,748,635us-gaap_NoninterestBearingDepositLiabilities $ 2,663,503us-gaap_NoninterestBearingDepositLiabilities  
Interest-bearing demand 1,722,581trmk_InterestBearingDemand 1,923,701trmk_InterestBearingDemand  
Savings 3,280,060us-gaap_DepositsSavingsDeposits 2,997,294us-gaap_DepositsSavingsDeposits  
Time 1,947,082us-gaap_TimeDeposits 2,275,404us-gaap_TimeDeposits  
Total deposits 9,698,358us-gaap_Deposits 9,859,902us-gaap_Deposits  
Interest expense on deposits by type [Abstract]      
Interest-bearing demand 3,151us-gaap_InterestExpenseDemandDepositAccounts 3,948us-gaap_InterestExpenseDemandDepositAccounts 3,975us-gaap_InterestExpenseDemandDepositAccounts
Savings 2,949us-gaap_InterestExpenseSavingsDeposits 3,889us-gaap_InterestExpenseSavingsDeposits 6,004us-gaap_InterestExpenseSavingsDeposits
Time 9,223us-gaap_InterestExpenseTimeDeposits 11,881us-gaap_InterestExpenseTimeDeposits 14,625us-gaap_InterestExpenseTimeDeposits
Total 15,323us-gaap_InterestExpenseDeposits 19,718us-gaap_InterestExpenseDeposits 24,604us-gaap_InterestExpenseDeposits
Maturities of time deposits of $ 100000 or more [Abstract]      
3 months or less 199,087us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess 242,757us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess  
Over 3 months through 6 months 168,886us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths 208,863us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths  
Over 6 months through 12 months 227,130us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months 312,189us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months  
Over 12 months 222,119us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months 208,208us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months  
Total 817,222us-gaap_TimeDeposits100000OrMore 972,017us-gaap_TimeDeposits100000OrMore  
Maturities of interest-bearing deposits [Abstract]      
2015 1,462,039us-gaap_TimeDepositMaturitiesYearOne    
2016 272,973us-gaap_TimeDepositMaturitiesYearTwo    
2017 114,574us-gaap_TimeDepositMaturitiesYearThree    
2018 52,329us-gaap_TimeDepositMaturitiesYearFour    
2019 and thereafter 45,167us-gaap_TimeDepositMaturitiesAfterYearFive    
Total time deposits 1,947,082us-gaap_TimeDeposits 2,275,404us-gaap_TimeDeposits  
Interest-bearing deposits with no stated maturity 5,002,641trmk_InterestBearingDepositsWithNoStatedMaturity    
Total interest-bearing deposits $ 6,949,723us-gaap_InterestBearingDepositLiabilities $ 7,196,399us-gaap_InterestBearingDepositLiabilities